All this conforts the general rules I have for my computers...
I have always considered the content of the Windows default folders as potentialy lost, and I keep the following Windows folders empty as much as I can: Document, Music, Videos, Desktop, Download.
The content, when it exists, is transient, not important, junk...no need for any backup.
All my (real/valuable) documents, links, music, are ...somewhere else (different folders / partitions / HDs depending on my computers), where I have full control and good backups.
Also, I do not install any soft in the "Program Files" folder as much as I can.
Microsoft cloud, or any cloud solution...No confidence. I keep nothing, except files that I have to transfer to somebody else.